Don't send to Gmail over IPv6

Re:Don't send to Gmail over IPv6 by AshamedCaptain on Friday June 03, 2022 @02:06PM (#31611708)

My experience is that all of SPF, DKIM and DMARC are almost completely ignored by Gmail -- one day I simply stopped DKIM and DMARC and Google keep happily accepting emails (and to this day I still send emails without). In fact they will happily accept emails even when the SPF check didn't pass and the policy clearly says strict reject aka -all .

While on the other hand I fully agree with TFA: I have _never_ been able to send an email to Gmail from a IPv6 address and have it not end up as spam, not even to accounts where I already whitelisted previous attempts.

I don't think it's a reputation issue, since my IPv4 addresses likely have much worse reputation. It's as if they just handicap all IPv6 addresses.

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Re:Don't send to Gmail over IPv6 by kevincox on Friday June 03, 2022 @02:28PM (#31611946)

GMail definitely respects my DMARC reject policy. But IDK how missing one of SPF or DKIM affect its spam decision. But with DMARC reject and both missing or invalid it will bounce the message every time I have seen.

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Re:Don't send to Gmail over IPv6 by tomatocracy on Friday June 03, 2022 @05:10PM (#31613650)

Automatic mail forwarding without altering the From address will cause DMARC alignment for SPF to break. This is a common enough legitimate setup that most providers seem to effectively downgrade the DMARC policy applied when they see this (usually reject becomes quarantine, quarantine becomes ignore).

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